In medical terminology, a condition related to pain, pressure, or deformity of the cranium or skull; a pathological condition of the head.
From Greek 'aigos' (pain, ache—though some sources suggest confusion with 'aigis' or other roots) plus 'kranion' (skull, cranium). This is an obsolete medical term from earlier taxonomies of skull diseases.
Old medical terminology is full of these mysterious compound words—'aegicrania' is so obscure it barely appears in modern dictionaries, a ghost word left behind when medicine switched to clearer, more logical naming systems.
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